A sunken green land under sponge city

Abstract

The application relates to a sunken green land under a sponge city, which comprises a sunken green land body, the sunken green land body comprises a plain soil ramming layer, a gravel layer and a soil layer from bottom to top in sequence, green plants are planted on the soil layer, a drainage pipeline is embedded in the soil layer, a water inlet slot is formed in the top wall of the drainage pipeline, a water seepage well is embedded in the sunken green land body, a plurality of water guide pipes are communicated with the water seepage well, the water guide pipes are communicated with the drainage pipeline, an overflow pipe is communicated with the water seepage well, the overflow pipe is used for being communicated with a municipal rainwater pipe, the bottom wall of the water seepage well is provided with an opening, a fine sand layer, a sandstone layer, an artificial cloth layer and a water permeable concrete layer are sequentially arranged in the water seepage well from top to bottom. The application has the effect that when the rainfall is too large, rainwater is not easy to gather in the sunken green land and form water accumulation.

Description

Technical Field

[0001] This application relates to the technical field of sponge cities, and in particular to a sunken green space for sponge cities. Background Technology

[0002] Sponge city is a new generation of urban stormwater management concept, referring to a city's good "elasticity" in adapting to environmental changes and responding to natural disasters caused by rainwater. It can also be called a "water-resilient city." The city can be like a sponge, with good "elasticity" in adapting to environmental changes and responding to natural disasters. The internationally used term is "low impact development stormwater system construction." When it rains, it absorbs, stores, infiltrates, and purifies rainwater, collects it, and "releases" and utilizes the stored water when needed, realizing the free migration of rainwater in the city.

[0003] Currently, the construction of sponge cities typically involves the creation of "sponge bodies." These urban "sponge bodies" include not only water systems such as rivers, lakes, and ponds, but also urban infrastructure such as green spaces, gardens, and permeable pavements. Rainwater infiltrates, is retained, purified, and reused through these "sponge bodies," with the remaining runoff discharged through pipe networks and pumping stations. The green space system includes sunken green spaces and the green areas set on both sides of the sunken green spaces. The sunken green spaces consist of, from bottom to top, a compacted soil layer, a gravel layer, a soil layer, and a planting layer. During rainfall, rainwater flows into the sunken green spaces and infiltrates into the ground through the planting layer, soil layer, gravel layer, and compacted soil layer in sequence, thereby effectively improving the standards of the urban drainage system and alleviating the pressure of urban flooding.

[0004] However, sunken green spaces have limited water infiltration capacity. When rainfall is excessive, rainwater can easily accumulate in the sunken green spaces, causing water to overflow onto the road surface and affecting people's normal passage. Summary of the Invention

[0005] To address the problems existing in the prior art, this application provides a sunken green space for sponge cities, which has the effect that when the rainfall is too heavy, rainwater is not easily collected in the sunken green space and forms water accumulation.

[0006] This application provides a sunken green space for sponge cities, which adopts the following technical solution: A type of sunken green space for sponge cities includes a sunken green space body, which comprises, from bottom to top, a compacted soil layer, a gravel layer, and a soil layer. Green plants are planted on the soil layer. Drainage pipes are buried within the soil layer, and water inlet slits are provided in the top walls of the drainage pipes. Infiltration wells are buried within the sunken green space body, and multiple water guide pipes are connected to the infiltration wells. These water guide pipes are connected to the drainage pipes. An overflow pipe is connected to the infiltration wells and is used to connect to municipal stormwater pipes. An opening is provided in the bottom wall of each infiltration well. From top to bottom, the infiltration well contains a fine sand layer, a gravel layer, an artificial fabric layer, and a permeable concrete layer.

[0007] By adopting the above technical solution, when rainfall is excessive, rainwater flows into the sunken green space. Some of the rainwater seeps into the ground successively through the vegetation, soil layer, gravel layer, and compacted subgrade layer. When the rainfall exceeds the maximum infiltration capacity of the sunken green space, the rainwater enters the drainage pipe through the inlet slits and collects inside. Then, through multiple drainage pipes, the rainwater in the drainage pipe is directed into infiltration wells. The rainwater entering the infiltration wells is filtered through a fine sand layer, gravel layer, artificial fabric layer, and permeable concrete layer before seeping into the ground. As the amount of rainwater entering the infiltration wells increases, the water level in the infiltration wells also... As the water level rises, when it reaches the overflow pipe, rainwater is channeled through the overflow pipe into the municipal storm drain for discharge. This helps prevent rainwater from accumulating in sunken green spaces and overflowing onto the road surface during periods of heavy rainfall, thus hindering normal pedestrian traffic. Furthermore, since municipal storm drains are typically directly connected to rivers, the rainwater entering the infiltration wells settles before being discharged through the overflow pipe. This helps prevent garbage or debris carried in the water from entering the river and causing pollution, thus protecting the ecological environment while achieving drainage.

[0008] Optionally, a first retaining plate and a second retaining plate are fixedly installed on the top wall of the drainage pipe, and the first retaining plate and the second retaining plate are respectively located on both sides of the water inlet joint, and both the first retaining plate and the second retaining plate are buried in the soil layer.

[0009] By adopting the above technical solution, the soil layer is blocked by the first and second retaining plates, thereby preventing soil from entering the drainage pipe through the water inlet gap and causing soil erosion to a certain extent.

[0010] Optionally, a waterstop plate is rotatably provided on one end of the first retaining plate near the second retaining plate. The waterstop plate is used to seal the water inlet joint. The drainage pipe is provided with a drive component for driving the waterstop plate to deflect towards or away from the second retaining plate.

[0011] By adopting the above technical solution, since urban rainfall first flows into the sunken green space and collects, and then seeps into the ground through the sunken green space, when the rainfall in the city does not exceed the maximum seepage capacity of the sunken green space, the driving component drives the water stop plate to deflect towards the second retaining plate to seal the water inlet joint. This prevents water entering the sunken green space from directly entering the drainage pipe through the water inlet joint to a certain extent, causing the water absorption of green plants in different locations within the sunken green space to vary, resulting in water shortage and death of green plants in areas with less water absorption.

[0012] Optionally, the driving assembly includes an elastic element, a water level tank, a float, and a first pull rope. The elastic element is used to drive the waterstop plate to deflect towards the second retaining plate. The water level tank is buried in the soil layer and is connected to a water inlet pipe that extends to the outside of the soil layer. The bottom wall of the water level tank has seepage holes. The float is slidably disposed in the water level tank. One end of the first pull rope is fixedly connected to the float, and the other end of the first pull rope is fixedly connected to the waterstop plate. The first pull rope is used to drive the waterstop plate to deflect away from the second retaining plate.

[0013] By adopting the above technical solution, when the rainfall is low, the waterstop plate deflects towards the second retaining plate under the elastic force of the elastic element, sealing the water inlet joint. Rainwater entering the water level tank through the water inlet pipe seeps directly into the ground through the seepage holes on the water level tank. When water accumulates in the sunken green space, the water enters the water level tank through the water inlet pipe. The seepage holes cannot keep up with the water level, causing the water level in the water level tank to rise, which in turn causes the float to rise. The float pulls the waterstop plate away from the second retaining plate through the first pull rope, thereby opening the water inlet joint and draining the water accumulated in the sunken green space. This eliminates the need for staff to manually control the deflection of the waterstop plate and open or close the water inlet joint, improving the timeliness of drainage in the sunken green space.

[0014] Optionally, a fixing block is fixedly provided at the end of the second retaining plate away from the first retaining plate, and a receiving groove is provided at the end of the second retaining plate close to the first retaining plate. The receiving groove extends into the fixing block, and a limiting block is slidably provided in the receiving groove along the direction close to or away from the first retaining plate. A transmission component for driving the limiting block to slide is connected to the floating block, and the limiting block is used to prevent the waterstop plate from deflecting away from the second retaining plate.

[0015] By adopting the above technical solution, during the process of sealing the water inlet joint, the waterstop plate is driven by the transmission component to slide the limiting block towards the first retaining plate, preventing the waterstop plate from deflecting away from the second retaining plate. This, to a certain extent, prevents the waterstop plate from deflecting due to external pressure, thereby opening the water inlet joint.

[0016] Optionally, the transmission assembly includes a winding wheel, a transmission gear, a rack, a torsion spring, and a second pull rope. The winding wheel is rotatably disposed within the receiving groove. The transmission gear is coaxially and fixedly connected to the winding wheel. The rack is fixedly disposed on the limiting block, and the length direction of the rack is parallel to the sliding direction of the limiting block. The rack meshes with the transmission gear. The torsion spring drives the winding wheel to rotate and causes the limiting block to slide towards the first retaining plate. The second pull rope is wound around the winding wheel, and the end of the second pull rope away from the winding wheel is fixedly connected to the float. The second pull rope is used to drive the winding wheel to rotate and cause the limiting block to slide away from the first retaining plate.

[0017] By adopting the above technical solution, during the upward movement of the float, the second pull rope drives the winding wheel to rotate, thereby driving the transmission gear to rotate. The transmission gear drives the rack to slide towards the bottom wall of the receiving groove, thereby allowing the limiting block to enter the receiving groove. Then, the first pull rope drives the waterstop plate to deflect. When the float moves downward, the waterstop plate first deflects towards the second retaining plate under the elastic force of the elastic element, sealing the water inlet gap. Then, the winding wheel drives the winding wheel to rotate under the elastic force of the torsion spring, thereby causing the limiting block to slide towards the first retaining plate, preventing the waterstop plate from deflecting.

[0018] Optionally, the water level tank is connected to a first pipe and a second pipe. The first pipe extends between the first retaining plate and the second retaining plate. The first pull rope slides through the first pipe, and the second pipe extends into the receiving groove. The second pull rope slides through the second pipe.

[0019] By adopting the above technical solution, and by setting up the first and second connecting pipes, and threading the first and second pull ropes through the first or second connecting pipes, the friction between the first and second pull ropes and the water level tank or drainage pipe is reduced, making the sliding of the first and second pull ropes smoother. In addition, the setting of the first and second connecting pipes can also prevent the first and second pull ropes from being corroded by water for a long time and from aging or breaking.

[0020] Optionally, a plurality of retaining frames are laid on the gravel layer, and the retaining frames are embedded in the soil layer, with permeable cloth installed inside the retaining frames.

[0021] By adopting the above technical solution, when rainwater seeps into the gravel layer through the soil layer, it first enters the retaining frame. The permeable cloth inside the retaining frame blocks the soil, thereby preventing the soil from sinking into the gravel layer with the rainwater to a certain extent, which would result in too little soil in the soil layer and thus affect the growth of green plants.

[0022] Optionally, a connecting plate is provided between two adjacent retaining frames. The connecting plate includes an insertion section and a connecting section. The insertion section is used to insert into the gap between two adjacent retaining frames. Insert blocks are fixedly provided at both ends of the insertion section. The side wall of the retaining frame is provided with a plug groove for inserting the plug blocks.

[0023] By adopting the above technical solution, when laying the retaining frame, a connecting plate is placed between two adjacent retaining frames, so that the insertion section of the connecting plate is inserted into the gap between the two adjacent retaining frames, and the inserts at both ends of the insertion section are inserted into the insertion slots of the two adjacent retaining frames respectively. This can prevent serious vertical misalignment between the two adjacent retaining frames during the use of the sunken green space body, so as to prevent the surface of the sunken green space body from having bulges or depressions.

[0024] Optionally, the insert block is covered with a water-absorbing and expanding sponge.

[0025] By adopting the above technical solution, when the sunken green space body is in use, the water-absorbing and expanding sponge absorbs the moisture in the soil layer and expands, which to a certain extent prevents the insert block from falling out of the insertion groove, thereby increasing the stability between two adjacent retaining frames.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. When the rainfall exceeds the maximum infiltration capacity of the sunken green space, the rainwater enters the drainage pipe through the inlet seam and collects. Then, it is guided into the infiltration well through multiple water pipes. The rainwater entering the infiltration well is filtered through a fine sand layer, a gravel layer, an artificial cloth layer, and a permeable concrete layer before seeping into the ground. As the amount of rainwater entering the infiltration well increases, the water level in the infiltration well also rises. When the water level in the infiltration well reaches the overflow pipe, the rainwater is discharged through the overflow pipe into the municipal stormwater pipe. This helps to prevent rainwater from accumulating in the sunken green space and overflowing onto the road surface when the rainfall is too heavy, thus affecting people's normal passage. 2. Since urban rainfall first flows into the sunken green space and collects, and then seeps into the ground through the sunken green space, when the rainfall in the city does not exceed the maximum seepage capacity of the sunken green space, the driving component drives the water stop plate to deflect towards the second retaining plate to seal the water inlet joint. This prevents water entering the sunken green space from directly entering the drainage pipe through the water inlet joint to a certain extent, causing the water absorption of the green plants in different locations in the sunken green space to be different, resulting in the green plants in the less water-absorbing areas becoming dehydrated and dying. 3. When rainfall is low, the waterstop plate deflects towards the second retaining plate under the elastic force of the elastic element, sealing the water inlet joint. Rainwater entering the water level tank through the inlet pipe seeps directly into the ground through the seepage holes on the water level tank. When water accumulates in the sunken green space, the water enters the water level tank through the inlet pipe. The seepage holes cannot keep up with the water level, causing the water level in the water level tank to rise, which in turn causes the float to rise. The float pulls the waterstop plate away from the second retaining plate through the first pull rope, thereby opening the water inlet joint and draining the water accumulated in the sunken green space. This eliminates the need for staff to manually control the deflection of the waterstop plate and open or close the water inlet joint, improving the timeliness of drainage in the sunken green space. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a structural cross-sectional view of an embodiment of this application; Figure 3 This is a partial structural cross-sectional view of an embodiment of this application, mainly used to illustrate the structural schematic diagram of the drainage pipe; Figure 4 yes Figure 3 Enlarged view of section A; Figure 5 This is a structural cross-sectional view of an embodiment of this application; Figure 6 This is a partial structural schematic diagram of an embodiment of this application, mainly used to illustrate the structural schematic diagram of the retaining frame; Figure 7 yes Figure 6 A magnified view of section B.

[0028] Explanation of reference numerals in the attached drawings: 1. Sunken green space body; 11. Compacted soil layer; 12. Gravel layer; 13. Soil layer; 2. Infiltration well; 21. Well cover; 22. Overflow pipe; 23. Water guide pipe; 24. Fine sand layer; 25. Gravel layer; 26. Artificial fabric layer; 27. Permeable concrete layer; 3. Drainage pipe; 31. Inlet joint; 32. First retaining wall; 321. Installation groove; 322. Water stop plate; 33. Second retaining wall; 331. Fixing block; 3311. Support; 332. Reception groove; 333. Limiting block; 34. Filter plate; 341 4. Drive assembly; 41. Compression spring; 42. Water level tank; 421. Water inlet pipe; 422. Water seepage hole; 423. Slide groove; 424. First through pipe; 425. Second through pipe; 43. Float; 431. Sliding block; 44. First pull rope; 5. Transmission assembly; 51. Winding wheel; 52. Transmission gear; 53. Rack; 54. Torsion spring; 55. Second pull rope; 6. Retaining frame; 61. Permeable cloth; 62. Insertion groove; 7. Connecting plate; 71. Connecting section; 72. Insertion section; 721. Insertion block; 722. Water-absorbing and expanding sponge. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0030] This application discloses a sunken green space for sponge cities. (Refer to...) Figure 1 The structure includes a sunken green space body 1 and planting areas set on both sides of the sunken green space body 1. A seepage well 2 is buried in the sunken green space body 1. The top of the planting area is set horizontally. The planting area is used to plant various plants. The sunken green space body 1 includes a compacted soil layer 11, a gravel layer 12 and a soil layer 13 from bottom to top. Green plants are planted on the soil layer 13. When there is rainfall, rainwater flows into the sunken green space body 1 through the planting areas on both sides and seeps into the ground through the green plants, soil layer 13, gravel layer 12 and compacted soil layer 11 in sequence.

[0031] Reference Figure 2 , 3 The top of the infiltration well 2 is open and located outside the sunken green space body 1. The top of the infiltration well 2 is covered with a well cover 21. An overflow pipe 22 is connected to the infiltration well 2. The overflow pipe 22 is buried in the gravel layer 12 and is connected to the municipal rainwater pipe. A drainage pipe 3 is buried in the soil layer 13. A water inlet slit 31 is opened on the top wall of the drainage pipe 3 along the length of the drainage pipe 3. Multiple water guide pipes 23 are connected to the infiltration well 2. All multiple water guide pipes 23 are connected to the drainage pipe 3. A filter screen is installed at the end of the water guide pipe 23 near the drainage pipe 3.

[0032] When the rainfall exceeds the maximum infiltration capacity of the sunken green space 1, the rainwater flows into the drainage pipe 3 through the inlet joint 31 and collects. Then, the rainwater in the drainage pipe 3 is directed into the infiltration well 2 through multiple water pipes 23. As the amount of rainwater entering the infiltration well 2 increases, the water level in the infiltration well 2 also rises. When the water level in the infiltration well 2 reaches the overflow pipe 22, the rainwater is discharged through the overflow pipe 22 into the municipal stormwater pipe. This prevents, to some extent, the rainwater from accumulating in the sunken green space and overflowing onto the road surface when the rainfall is too heavy, thus affecting people's normal passage.

[0033] Reference Figure 2The bottom wall of the infiltration well 2 has an opening. Inside the infiltration well 2, from top to bottom, there are layers of fine sand 24, gravel 25, artificial fabric 26, and permeable concrete 27. Since municipal rainwater pipes are usually directly connected to rivers, the rainwater entering the infiltration well 2 is filtered through the fine sand layer 24, gravel layer 25, artificial fabric 26, and permeable concrete 27 before seeping into the ground. The rainwater entering the infiltration well 2 is then settled before entering the overflow pipe 22 for discharge. This prevents garbage or debris carried in the water from entering the river and causing river pollution to a certain extent, thus protecting the ecological environment while achieving drainage.

[0034] Reference Figure 3 , 4 A first retaining plate 32 and a second retaining plate 33 are fixedly installed on the top wall of the drainage pipe 3. The first retaining plate 32 and the second retaining plate 33 are respectively located on both sides of the water inlet joint 31. The first retaining plate 32 and the second retaining plate 33 are buried in the soil layer 13. The first retaining plate 32 and the second retaining plate 33 block the soil layer 13, thereby preventing soil from entering the drainage pipe 3 through the water inlet joint 31 and causing soil erosion.

[0035] Reference Figure 4 A filter plate 34 is fixedly installed between the first retaining plate 32 and the second retaining plate 33. The filter plate 34 has several water inlets 341. The filter plate 34 blocks some large garbage or debris on the ground, and to a certain extent prevents debris from entering the drainage pipe 3 and causing the water pipe 23 to be blocked.

[0036] Reference Figure 4 An installation groove 321 is provided on the first retaining plate 32 near the second retaining plate 33 along the length direction of the first retaining plate 32. A waterstop plate 322 is rotatably installed in the installation groove 321. The rotation axis of the waterstop plate 322 is parallel to the length direction of the first retaining plate 32, and the waterstop plate 322 is located below the filter plate 34. When the end of the waterstop plate 322 away from the first retaining plate 32 abuts against the second retaining plate 33, the top wall of the waterstop plate 322 is in contact with the filter plate 34, and the water inlet 31 is closed. A drive assembly 4 is provided on the drainage pipe 3 to drive the waterstop plate 322 to deflect towards or away from the second retaining plate 33.

[0037] Since urban rainfall first flows into the sunken green space body 1 and collects, and then seeps into the ground through the sunken green space body 1, when the rainfall in the city does not exceed the maximum seepage capacity of the sunken green space body 1, the driving component 4 drives the water stop plate 322 to deflect towards the second retaining plate 33 to seal the water inlet joint 31. This prevents water entering the sunken green space body 1 from directly entering the drainage pipe 3 through the water inlet joint 31, causing the water absorption of green plants in different locations in the sunken green space body 1 to be different, resulting in the green plants in the less water-absorbing areas becoming dehydrated and dying.

[0038] Reference Figure 3 , 4 The drive assembly 4 includes an elastic element, a water level tank 42, a float 43, and a first pull rope 44. The elastic element includes a compression spring 41, and multiple compression springs 41 are provided. One end of the compression spring 41 is fixedly connected to the side wall of the mounting groove 321 near the drainage pipe 3, and the other end of the compression spring 41 is fixedly connected to the side of the waterstop plate 322 away from the rotating shaft. When the rainfall is low, the waterstop plate 322 deflects towards the second retaining plate 33 under the elastic force of the compression spring 41, thereby sealing the water inlet gap 31.

[0039] Reference Figure 2 , 3 The water level tank 42 is buried in the soil layer 13. The water level tank 42 is connected to the water inlet pipe 421, and the water inlet pipe 421 extends to the outside of the soil layer 13. A filter screen is also fixedly installed at the end of the water inlet pipe 421 away from the water level tank 42. Several seepage holes 422 are opened on the bottom wall of the water level tank 42. The float 43 is slidably installed in the water level tank 42 in the vertical direction. The inner side wall of the water level tank 42 is provided with a sliding groove 423 in the vertical direction. A slider 431 is slidably installed in the sliding groove 423. The cross section of the slider 431 is T-shaped. The sliding groove 423 is adapted to the slider 431. The float 43 and the slider 431 are fixedly connected.

[0040] Reference Figure 3 , 4 The water level tank 42 is connected to a first pipe 424, which extends between the first retaining plate 32 and the second retaining plate 33. A first pull rope 44 is slidably inserted into the first pipe 424. One end of the first pull rope 44 is fixedly connected to a float 43, and the other end of the first pull rope 44 is fixedly connected to the side of the waterstop plate 322 away from the first retaining plate 32. When water accumulates in the sunken green space body 1, the water enters the water level tank 42 through the inlet pipe 421. The seepage hole 422 does not seep enough water to raise the water level in the water level tank 42, which in turn raises the float 43. The float 43 pulls the waterstop plate 322 away from the second retaining plate 33 through the first pull rope 44, thereby opening the water inlet joint 31 and draining the water in the sunken green space body 1. This eliminates the need for staff to manually control the waterstop plate 322 to deflect and open or close the water inlet joint 31, thus improving the timeliness of drainage of the sunken green space body 1.

[0041] Reference Figure 4 A fixing block 331 is fixedly installed at the end of the second retaining plate 33 away from the first retaining plate 32. A receiving groove 332 is opened at the end of the second retaining plate 33 near the first retaining plate 32 along a direction perpendicular to the second retaining plate 33. The receiving groove 332 extends into the fixing block 331. A limiting block 333 is slidably installed in the receiving groove 332 along a direction perpendicular to the first retaining plate 32. A transmission component 5 for driving the limiting block 333 to slide is connected to the float 43. When the waterstop plate 322 is in contact with the filter plate 34 When the water inlet joint 31 is closed, the limiting block 333 slides out of the receiving groove 332 and abuts against the bottom wall of the waterstop plate 322, preventing the waterstop plate 322 from deflecting downwards. During the process of the waterstop plate 322 closing the water inlet joint 31, the limiting block 333 is driven by the transmission component 5 to slide towards the first retaining plate 32 and abut against the bottom wall of the waterstop plate 322, preventing the waterstop plate 322 from deflecting away from the second retaining plate 33. This prevents the waterstop plate 322 from deflecting due to external pressure, thereby opening the water inlet joint 31.

[0042] Reference Figure 4 The end of the limiting block 333 near the first retaining plate 32 gradually approaches the second retaining plate 33 in the direction away from the drainage pipe 3. After a period of use, the elastic force of the compression spring 41 will be weakened to a certain extent, so that the water stop plate 322 blocks the receiving groove 332. The inclined surface on the limiting block 333 facilitates the limiting block 333 to slide out of the receiving groove 332.

[0043] Reference Figure 4 The transmission assembly 5 includes a winding wheel 51, a transmission gear 52, a rack 53, a torsion spring 54, and a second pull rope 55. A bracket 3311 is fixedly installed in the receiving groove 332 on the side of the limiting block 333 away from the first retaining plate 32. A rotating shaft is fixedly installed coaxially on the winding wheel 51 and is rotatably mounted on the bracket 3311. The transmission gear 52 is fixedly connected coaxially to the rotating shaft. The rack 53 is fixedly connected to the end of the limiting block 333 away from the first retaining plate 32, and the length direction of the rack 53 is parallel to the sliding direction of the limiting block 333. The rack 53 meshes with the transmission gear 52. The torsion spring 54 is sleeved on the rotating shaft. One end of the torsion spring 54 is fixedly connected to the bracket 3311, and the other end of the torsion spring 54 is fixedly connected to the bracket 3311. When the torsion spring 54 drives the winding wheel 51 to rotate, the rotation of the transmission gear 52 can drive the limiting block 333 to slide closer to the first retaining plate 32.

[0044] Reference Figure 3 , 4The water level tank 42 is also connected to a second pipe 425, which extends into the receiving groove 332. A second pull rope 55 is slidably inserted into the second pipe 425. One end of the second pull rope 55 is wound around the winding wheel 51, and the end of the second pull rope 55 away from the winding wheel 51 is fixedly connected to the float 43. When the slider 431 abuts against the lower side wall of the slide groove 423, the first pull rope 44 is in a slack state, and the second pull rope 55 is in a taut state. When the limiting block 333 is disengaged from the water stop plate 322, the first pull rope 44 is just in a taut state.

[0045] During the upward movement of the float 43, the second pull rope 55 drives the winding wheel 51 to rotate, thereby driving the transmission gear 52 to rotate. The transmission gear 52 drives the rack 53 to slide towards the bottom wall of the receiving groove 332, thereby allowing the limiting block 333 to enter the receiving groove 332. Afterward, the first pull rope 44 is in a taut state, and the float 43 continues to rise. The first pull rope 44 drives the waterstop plate 322 to deflect downward, thereby opening the water inlet gap 31. When the float 43 moves downward, the waterstop plate 322 first deflects towards the second retaining plate 33 under the elastic force of the compression spring 41, sealing the water inlet gap 31. Afterward, the first pull rope 44 is in a slack state, and the winding wheel 51 is driven to rotate under the elastic force of the torsion spring 54, thereby causing the limiting block 333 to slide towards the first retaining plate 32, preventing the waterstop plate 322 from deflecting downward.

[0046] Reference Figure 5 , 6 Several retaining frames 6 are laid on the gravel layer 12. The retaining frames 6 are square and embedded in the soil layer 13. A permeable cloth 61 is installed inside the retaining frame 6.

[0047] Reference Figure 6 , 7 A connecting plate 7 is provided between each of the two adjacent retaining frames 6. The connecting plate 7 has a T-shaped cross section and includes an insertion section 72 and a connecting section 71. The insertion section 72 is used to insert into the gap between the two adjacent retaining frames 6. Insert blocks 721 are fixedly provided at both ends of the insertion section 72. The length direction of the insert blocks 721 is parallel to the length direction of the connecting plate 7. Insertion slots 62 for inserting the insert blocks 721 are provided on the four side walls of the retaining frame 6.

[0048] During construction of the sunken green space body 1, several retaining frames 6 are laid on the gravel layer 12. When laying the retaining frames 6, connecting plates 7 are placed between adjacent retaining frames 6, so that the insertion section 72 of the connecting plate 7 is inserted into the gap between the two adjacent retaining frames 6, and the inserts 721 at both ends of the insertion section 72 are inserted into the insertion grooves 62 of the two adjacent retaining frames 6 respectively. Then, a soil layer 13 is laid on the retaining frames 6. When rainwater seeps into the gravel layer 12 through the soil layer 13, it first enters the retaining frames 6. The water-permeable cloth 61 inside the retaining frames 6 blocks the soil, thereby preventing the soil from sinking into the gravel layer 12 with the rainwater to a certain extent, resulting in too little soil in the soil layer 13, which would affect the growth of the green plants. In addition, the connecting plates 7 prevent the vertical misalignment between adjacent retaining frames 6 during the use of the sunken green space body 1, so as to prevent the surface of the sunken green space body 1 from having bulges or depressions.

[0049] Reference Figure 7 The insert 721 is covered with a water-absorbing and expanding sponge 722; when the recessed green space body 1 is in use, the water-absorbing and expanding sponge 722 absorbs the water in the soil layer 13 and expands, and to a certain extent prevents the insert 721 from falling out of the insertion groove 62, thereby increasing the stability between the two adjacent retaining frames 6.

[0050] The implementation principle of a sunken green space in a sponge city according to an embodiment of this application is as follows: When the rainfall is too heavy, rainwater flows into the sunken green space body 1 through the planting areas on both sides. Some of the rainwater seeps into the ground through the green plants, soil layer 13, small gravel layer 12 and compacted soil layer 11 in sequence. When the rainfall exceeds the maximum infiltration capacity of the sunken green space body 1, the rainwater enters the drainage pipe 3 through the water inlet slit 31 on the drainage pipe 3 and collects. Then, the rainwater in the drainage pipe 3 is guided into the infiltration well 2 through multiple water pipes 23. The rainwater entering the infiltration well 2 is filtered through the fine sand layer 24, gravel layer 25, artificial cloth layer 26 and permeable concrete layer 27 in sequence before seeping into the ground.

[0051] As more rainwater enters the infiltration well 2, the water level in the infiltration well 2 also rises. When the water level in the infiltration well 2 reaches the overflow pipe 22, the rainwater is discharged through the overflow pipe 22 into the municipal stormwater pipe. This helps to prevent rainwater from accumulating in the sunken green space and overflowing onto the road surface when rainfall is excessive, thus affecting people's normal passage.

[0052] Furthermore, since municipal stormwater pipes are usually directly connected to rivers, the rainwater entering the infiltration well 2 is first allowed to settle in the infiltration well 2 before being discharged through the overflow pipe 22. This prevents garbage or debris carried in the water from entering the river and causing river pollution, thus protecting the ecological environment while achieving drainage. When the garbage settled in the infiltration well 2 accumulates to a certain extent, it can be cleaned by opening the well cover 21.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sunken green space for sponge cities, comprising a sunken green space body (1), wherein the sunken green space body (1) comprises, from bottom to top, a compacted soil layer (11), a gravel layer (12), and a soil layer (13), wherein green plants are planted on the soil layer (13), characterized in that: A drainage pipe (3) is buried in the soil layer (13). A water inlet slit (31) is opened on the top wall of the drainage pipe (3). A seepage well (2) is buried in the sunken green space body (1). Multiple water guide pipes (23) are connected to the seepage well (2). The water guide pipes (23) are connected to the drainage pipe (3). An overflow pipe (22) is connected to the seepage well (2). The overflow pipe (22) is used to connect to the municipal rainwater pipe. An opening is set in the bottom wall of the seepage well (2). A fine sand layer (24), a gravel layer (25), an artificial cloth layer (26), and a permeable concrete layer (27) are arranged in the seepage well (2) from top to bottom. The top wall of the drainage pipe (3) is fixedly provided with a first retaining plate (32) and a second retaining plate (33), and the first retaining plate (32) and the second retaining plate (33) are respectively located on both sides of the water inlet joint (31), and the first retaining plate (32) and the second retaining plate (33) are both buried in the soil layer (13). A waterstop plate (322) is rotatably provided on one end of the first retaining plate (32) near the second retaining plate (33). The waterstop plate (322) is used to seal the water inlet gap (31). A drive assembly (4) is provided on the drainage pipe (3) to drive the waterstop plate (322) to deflect towards or away from the second retaining plate (33). The driving component (4) includes an elastic element, a water level tank (42), a float (43), and a first pull rope (44). The elastic element is used to drive the waterstop plate (322) to deflect towards the second retaining plate (33). The water level tank (42) is buried in the soil layer (13). The water level tank (42) is connected to a water inlet pipe (421), and the water inlet pipe (421) extends to the outside of the soil layer (13). The bottom wall of the water level tank (42) is provided with a seepage hole (422). The float (43) is slidably disposed in the water level tank (42). One end of the first pull rope (44) is fixedly connected to the float (43), and the other end of the first pull rope (44) is fixedly connected to the waterstop plate (322). The first pull rope (44) is used to drive the waterstop plate (322) to deflect away from the second retaining plate (33). A fixing block (331) is fixedly installed at the end of the second retaining plate (33) away from the first retaining plate (32). A receiving groove (332) is opened at the end of the second retaining plate (33) close to the first retaining plate (32). The receiving groove (332) extends into the fixing block (331). A limiting block (333) is slidably installed in the receiving groove (332) in the direction close to or away from the first retaining plate (32). A transmission component (5) for driving the limiting block (333) to slide is connected to the floating block (43). The limiting block (333) is used to prevent the waterstop plate (322) from deflecting away from the second retaining plate (33). The transmission assembly (5) includes a winding wheel (51), a transmission gear (52), a rack (53), a torsion spring (54), and a second pull rope (55). The winding wheel (51) is rotatably disposed in the receiving groove (332). The transmission gear (52) is coaxially and fixedly connected to the winding wheel (51). The rack (53) is fixedly disposed on the limiting block (333), and the length direction of the rack (53) is parallel to the sliding direction of the limiting block (333). The rack (53) and the transmission gear... The wheel (52) meshes, and the torsion spring (54) drives the winding wheel (51) to rotate and drives the limiting block (333) to slide towards the first retaining plate (32). The second pull rope (55) is wound on the winding wheel (51), and the end of the second pull rope (55) away from the winding wheel (51) is fixedly connected to the float (43). The second pull rope (55) is used to drive the winding wheel (51) to rotate and drive the limiting block (333) to slide away from the first retaining plate (32). The water level tank (42) is connected to a first pipe (424) and a second pipe (425). The first pipe (424) extends between the first retaining plate (32) and the second retaining plate (33). The first pull rope (44) slides through the first pipe (424). The second pipe (425) extends into the receiving groove (332). The second pull rope (55) slides through the second pipe (425).

2. The sunken green space for sponge cities according to claim 1, characterized in that: Several retaining frames (6) are laid on the gravel layer (12), and the retaining frames (6) are embedded in the soil layer (13). A permeable cloth (61) is installed inside the retaining frames (6).

3. The sunken green space for sponge cities according to claim 2, characterized in that: A connecting plate (7) is provided between each of the two adjacent retaining frames (6). The connecting plate (7) includes an insertion section (72) and a connecting section (71). The insertion section (72) is used to insert into the gap between the two adjacent retaining frames (6). Insert blocks (721) are fixedly provided at both ends of the insertion section (72). The side wall of the retaining frame (6) is provided with a insertion groove (62) for inserting the insert blocks (721).

4. A sunken green space for sponge cities according to claim 3, characterized in that: The insert (721) is covered with a water-absorbing and expanding sponge (722).

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